PHPUnit_Framework_Assert::assertJsonStringEqualsJsonString PHP Method

    public static function assertJsonStringEqualsJsonString($expectedJson, $actualJson, $message = '')
    {
        static::assertJson($expectedJson, $message);
        static::assertJson($actualJson, $message);
        $expected = json_decode($expectedJson);
        $actual = json_decode($actualJson);
        static::assertEquals($expected, $actual, $message);
    }

 public function isEqualToJsonString($string)
 {
     Assert::assertJsonStringEqualsJsonString($string, $this->actual, $this->description);
     return $this;
 }